São Tomé Island, at 854 km2 (330 sq mi), is the largest island of São Tomé and Príncipe and is home to about 157,000 or 96% of the nation's population. The island is divided into six districts. It is located 2 km (1¼ miles) north of the equator.

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São Tomé Island is about 48 kilometres (30 miles) long (north-south) by 32 kilometres (20 miles) wide (east-west). It rises to 2,024 metres (6,640 feet) at Pico de São Tomé and includes the capital city, São Tomé, on the northeast coast. The nearest city on mainland Africa is the port city of Port Gentil in Gabon located 240 kilometres (150 miles) to the east.

The entire island of São Tomé is a massive shield volcano that rises from the floor of the Atlantic Ocean, over 3,000 m (10,000 ft) below sea level. It formed along the Cameroon line, a line of volcanoes extending from Cameroon southwest into the Atlantic Ocean. Most of the lava erupted on São Tomé over the last million years has been basalt. The youngest dated rock on the island is about 100,000 years old, but numerous more recent cinder cones are found on the southeast side of the island.

Large reserves of oil are in the ocean between Nigeria and São Tomé. The discovery has been lamented by some as endangering the nation's political stability and natural environment. In response to these concerns the government of São Tomé and Príncipe has drawn up legislation in an attempt to ensure the efficient and equitable use of oil revenues over time.

The island has a total of 63 regular bird species, plus an additional 36 vagrant and unconfirmed species. Of these, 19 are endemic and 3 near endemic; in addition, the local subspecies of olive ibis (Bostrychia olivacea bocagei) is endemic and considered critically endangered. Six species are considered vulnerable, and two critically endangered (São Tomé fiscal and São Tomé grosbeak).[1]